Praise be to Allah.
We say to the one who is looking after the waqf: buy meat with the income generated by the waqf and distribute it to the poor. Do not do this only in the month of Rajab; rather do it in any month, because if a waqf includes something that is wrong, it should be put into practice without that wrong thing. What is wrong here in this case is singling out the month of Rajab for slaughtering the meat. This is to be avoided, and the meat should be slaughtered in any month and distributed to the poor as stated in the waqf. And Allaah knows best.